feat(P6/T01): Phase 6 schema — WidgetAdapterSpec, contracts, widgets.adapter_spec_id

Adds Phase 6 tables: envelope_emission_contracts, interaction_reporting_contracts,
widget_adapter_specs. Adds adapter_spec_id FK to widgets and api_key to hubs.
Seeds v1.0 contracts in migration. Registers Phase 6 controller types and routes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Application/Migration/1743465600-ihf-phase6-cross-framework-adaptation.sql

@@ -0,0 +1,91 @@
+-- IHF Phase 6 — Cross-Framework UI Adaptation Layer
+-- Adds: envelope_emission_contracts, interaction_reporting_contracts,
+--       widget_adapter_specs, widgets.adapter_spec_id, hubs.api_key
+-- Seeds: v1.0 contracts
+
+CREATE TABLE envelope_emission_contracts (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    contract_version TEXT NOT NULL UNIQUE,
+    required_attributes JSONB NOT NULL,
+    optional_attributes JSONB NOT NULL DEFAULT '[]',
+    validation_rules JSONB NOT NULL DEFAULT '{}',
+    description TEXT,
+    status TEXT NOT NULL DEFAULT 'active',
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL
+);
+
+CREATE INDEX envelope_emission_contracts_status_idx ON envelope_emission_contracts (status);
+
+CREATE TABLE interaction_reporting_contracts (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    contract_version TEXT NOT NULL UNIQUE,
+    endpoint_path TEXT NOT NULL,
+    accepted_event_types JSONB NOT NULL,
+    required_fields JSONB NOT NULL,
+    auth_scheme TEXT NOT NULL DEFAULT 'bearer',
+    description TEXT,
+    status TEXT NOT NULL DEFAULT 'active',
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL
+);
+
+CREATE INDEX interaction_reporting_contracts_status_idx ON interaction_reporting_contracts (status);
+
+CREATE TABLE widget_adapter_specs (
+    id UUID DEFAULT uuid_generate_v4() PRIMARY KEY NOT NULL,
+    name TEXT NOT NULL UNIQUE,
+    framework TEXT NOT NULL,
+    version TEXT NOT NULL,
+    envelope_contract_id UUID REFERENCES envelope_emission_contracts(id),
+    reporting_contract_id UUID REFERENCES interaction_reporting_contracts(id),
+    status TEXT NOT NULL DEFAULT 'draft',
+    notes TEXT,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL,
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL
+);
+
+CREATE INDEX widget_adapter_specs_framework_idx ON widget_adapter_specs (framework);
+CREATE INDEX widget_adapter_specs_status_idx ON widget_adapter_specs (status);
+
+ALTER TABLE widgets
+    ADD COLUMN adapter_spec_id UUID REFERENCES widget_adapter_specs(id);
+
+CREATE INDEX widgets_adapter_spec_id_idx ON widgets (adapter_spec_id);
+
+ALTER TABLE hubs
+    ADD COLUMN api_key TEXT;
+
+-- Seed: v1.0 EnvelopeEmissionContract
+INSERT INTO envelope_emission_contracts (
+    contract_version,
+    required_attributes,
+    optional_attributes,
+    validation_rules,
+    description,
+    status
+) VALUES (
+    '1.0',
+    '["data-widget-id", "data-view-context", "data-hub-id"]',
+    '["data-policy-scope", "data-widget-version"]',
+    '{"data-widget-id": "uuid", "data-hub-id": "uuid"}',
+    'Canonical IHF widget envelope contract v1.0. Requires widget identity, view context, and hub attribution on every rendered widget element.',
+    'active'
+);
+
+-- Seed: v1.0 InteractionReportingContract
+INSERT INTO interaction_reporting_contracts (
+    contract_version,
+    endpoint_path,
+    accepted_event_types,
+    required_fields,
+    auth_scheme,
+    description,
+    status
+) VALUES (
+    '1.0',
+    '/api/v1/interaction-events',
+    '["clicked", "viewed", "submitted", "dismissed", "errored"]',
+    '["widget_id", "hub_id", "event_type", "occurred_at"]',
+    'bearer',
+    'Canonical IHF interaction reporting contract v1.0. External adapters POST events to this endpoint using a hub-scoped bearer token.',
+    'active'
+);